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Decomposition of peroxodisulphate in aqueous alkaline solution

1976; Pergamon Press; Volume: 38; Issue: 3 Linguagem: Inglês

10.1016/0022-1902(76)80300-4

1878-1225

U. Chandra Singh, K. Venkatarao,

Chemical and Physical Properties in Aqueous Solutions

Results on the decomposition of S2O82− ion in highly alkaline conditions are presented. The rate of S2O82− disappearance RS2O82−, is found to be proportional to [OH−] and it is also possible to differentiate between two pathways of decomposition (i) homolytic cleavage of S2O82− to give SO4.− radicals and (ii) alkaline hydrolysis of S2O82− to give HSO4− and SO52−. The effect of ionic strength of the medium on these strength of the mediumm on these two reactions is discussed. Thermodynamic activation parameters, ΔH≠ and ΔS≠ have been calculated for these two reactions. The proposed mechanism is discussed in terms of the kinetic results.